Pascal (Lazarus/Delphi)

Get a Header Attribute of an Attached Message

Demonstrates the Chilkat Email.GetAttachedMessageAttr method, which returns a header-field attribute value for the Nth attached (embedded) email. The first argument is the zero-based attached-message index, the second is the header field name, and the third is the attribute name. This example attaches an email and reads the filename attribute of its Content-Disposition header.

Background: MIME header fields can carry named attributes (parameters) after the main value — for example Content-Disposition: attachment; filename="report.eml", where filename is an attribute. Rather than parsing the raw header yourself, this method extracts a single named attribute from a chosen header of a specific embedded message, which is convenient when a message forwards other emails as nested message/rfc822 parts.

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Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Email;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  innerEmail: TEmail;
  email: TEmail;
  fname: string;

begin
  success := False;

  //  Demonstrates the GetAttachedMessageAttr method, which returns a header-field attribute
  //  value for the Nth attached (embedded) email.  The first argument is the zero-based
  //  attached-message index, the second is the header field name, and the third is the attribute name.

  //  Build an inner email to attach.
  innerEmail := TEmail.Create;
  innerEmail.Subject := 'Embedded message';
  innerEmail.From := 'alice@example.com';
  innerEmail.AddTo('Bob','bob@example.com');

  //  Attach it to an outer email as a message/rfc822 part.
  email := TEmail.Create;
  email.Subject := 'Has an attached message';
  success := email.AttachEmail(innerEmail);
  if (success = False) then
    begin
      WriteLn(email.LastErrorText);
      Exit;
    end;

  //  Get the "filename" attribute of the "Content-Disposition" header of the first
  //  attached message (index 0).
  fname := email.GetAttachedMessageAttr(0,'Content-Disposition','filename');
  WriteLn('Attached message filename attribute: ' + fname);


  innerEmail.Free;
  email.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.